Question

The mean of three numbers is 51 all the three numbers are different natural numbers if two of them are 29 and 59 find third number

Answer 1

The third number is 65.

• Mean of three numbers is given as 51.
• Two of the numbers are 29 and 59.
• We have to find the third number
• Let us assume the third number to be 'x'

$\frac{29+59+x}{3} = 51$

$\frac{88+x}{3}  = 51$

88 + x = 153

x = 65  

Answer 2

The third number is 65

Step-by-step explanation:

Let the third number be x

Two numbers are 29 and 59

$Average = \frac{\text{Sum of all observation}}{\text{No. of observations}}$

We are given that The mean of three numbers is 51

So,$51=\frac{29+x+59}{3}\\51 \times 3 = 29+x+59 \\153=88+x\\153-88=x\\65=x$

Hence The third number is 65

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